value unc_up unc_lo author ref method 6.94 1.260 1.260 Nugent 2016AJ....152...63N NEATM 7.50 0.090 0.090 Masiero 2014ApJ...791..121M NEATM 7.77 0.080 0.080 Masiero 2014ApJ...791..121M NEATM 8.16 0.156 0.156 Masiero 2011ApJ...741...68M NEATM 8.40 0.049 0.049 Masiero 2011ApJ...741...68M NEATM